Electric welding apparatus



y 1, 1945. K. N. GEAY 2,374,930

ELECTRIC WELDING APPARATUS Filed Jan. 9, 1943 Elma/whom g a): i if/me f/z MG/uy,

QMW a electric outlet of alternating electricity.

Patented Mayl, 1945 UNITED "JSTA'FE s PATENT OFFICE ELECTRIC WELDING APPARATUS Kenneth N. Gray, Akron, Ohio, assignor of onehalf to Edward Bogard, Akron. Ohio Application January 9, 1943, Serial No. 471,864

1 Claim.

This invention relates to electric welding and more particularly to a welding apparatus in which the electric circuit thereof has an improved transformer to permit the-welder to easily change the heat at the welding pencil orstick at'will without varying the arc voltage, so that employed "to permit carrying out different weld ing operations without damage or injury to the welding pencil or stick in use and still. assure the striking of an electric arc at the work by the maintenance of the arc voltage substantiallyconstant.

Another object of this invention is the provision of an alternating current transformer different size welding sticks or pencils may be" The secondary winding l5 of the transformer surrounds the primary winding l4 and consists of a selected number and sizeof coiled wires I! thoroughly insulated from each other. Each wire I! ha one end electrically connected to a conductor H which connects to a terminal ll 0n the panel 9., The terminal iliselectrically connected Q to a ground plate "of the work to be electrically welded, by a conductor ll'.- The other ends of provided with an improved winding and a control switch therefor whereby a substantiallyconstant voltage and variable amperage at the output thereof may be had, the switch permitting.

the amperage to be progressively stepped up or stepped down as desired.

with these and other objects in view-as will become more apparent as the description proceeds, the invention consists in certain novel features of construction. combination and arent invention andshowing it' connected in acircuit of a welding apparatus.

Figure 2 is a diagrammatical view showing the welding apparatus circuit with'the transformer connected therein in accordance with my invention.

Figure 3 is a view similar to Figure 2 illustrating a modified form of my invention.

Referring in'detail to the drawing, the numerial 5 indicates as an entirety an alternating current transformer constructed in accordance with this invention and i a control switch. The core of the transformer is designated by the character I and I indicates the support therefor. An insulated panel 0 is mounted on the support and carries a plurality of terminals. The terminals l0 and II have an electric extension cord I! connected thereto whereby -the transformer may be plugged into an ordilrgilary ectric leads I! of a primary winding ll are'connected to the terminals "land H. The pri-. mary winding is arranged about the core I.

conductor It.

the wires It are electrically connected to terminals I! mounted on the panel 9. ,The tenninais I!" are connected to contacts 20 of the switch 8 by conductors 2|. The contacts are grouped in such way that they may be progressiveiy engaged and disengaged by a hand operated and pivotally mounted switch lever 22.

ii conductor 23 electrically connects the switch lever 22 to a holder 24 of a welding apparatus, the welding pencil or stick being indicated by the character".

' The described secondary winding ll of the transformer and the switch I. will permit the welder'to easily vary the amperage to the pencil or stick and consequently the welding heat with the voltage thereto remaining substantially constant in order that the welding arc may always be struck in carrying out a welding operation on the work. Y i

The amperage output from the transformer may be progressively stepped up or down by progressively engaging and disengaging the switch lever with the contacts. Thus through the use of the described transformer and switch, in circuit with the welding apparatus, the operator may easily vary the heat of the welding pencil or stick which allows different size pencils or sticks to be employed without danger of injury thereto.

' Referring to my-modifled form of invention,v

that heretofore described. The same core and support therefor is employed. The primary winding consists of a plurality of coiled wires arranged about the core and each insulated from the other and may be of diflerent size wires. Each wire. which is indicated by the character 28, has one end connected to one of the input terminals by a The lever 22 of the switch 0 is connected to the other input terminal by a conductor 3'. The other ends of the wires are connected to the contacts III of the switch. Surrounding the primary winding of the modified form of the invention. is the secondary winding 21, the ends of which are electrically connected to the ground plate for the work and the holder 24 g of the welding apparatus.

tion with the form of transformer shown in Flgure 2. The function -of the modified form of traisformer will be the same, that is, it will permit the welder to vary the heat at the pencil or stick with the arc voltage remaining substantially constant.

It is to be understood that the number of'wires which are employed to make up either the primary or secondary winding in the diil'erent forms of my invention may be varied as to number as well as to size of the wires. This variance is provided so that the device may be employed in electric circuits of welding apparatus used for varying kinds of welding operations, that is, either large or small operations.

While I have shown and described the preferred embodiment of my invention, it will be understood that minor changes in construction.

combination and armament of parts may be made without departing from the sprit and scope of the invention as claimed.

Having thus described the invention, what I claim is:

Electric welding apparatus including an A. C. circuit, a work holder, a welding stick, and a transformer, said transformer comprising a magnetic core. a primary winding associated with said core and connected to said circuit, a plurality of secondary windings inductively associated with said core and said primary winding and having one of their ends commonly connected to said work holder, spaced contacts arranged in stepped relation and separately connected with the other ends of said secondary windings, and a single switch lever electrically connected with said welding stick and cooperative with said contacts to progressively connect and disconnect said secondary windings to and from the work holder and said welding stick. I

mum-n N. GRAY. 

